Plumb-bob.



UNrrnDx STATES PATENT OFFICE.

ARNOLD NAOKE, OF PHILADELPHIA, PENNSYLVANIA. I

PLUMB-BOB.

SPECFATION forming part of Letters Patent No. 630,262, dated August 1, 1899.

Application filed March 14, 1 8 9 9.

T0 ((,ZZ whom, it n'tcty concern:

Be it known that I, ARNOLD NAGKE, a citizen of the United States, residing in the city and county of Philadelphia, State of Pennsyl- Vania, have invented a new and useful Improvement in Plumb-Bobs, which improvement is fully set forth in the following speciication and accompanying'drawings.

My inventiou consists of an improved construction of plumb bob which is provided with a movable pin which can be used either tight or loose while in work, said pin being readily removable in case of acoident or for the purpose of inspection or repairs, the point of which being adjustable to any desired length by means of an adjusting-nut or othei` similar device.

It also consists of means for allowing the pin to retreat into the body of the plumb-bob and of means for tightening the jaws engaging said pin by means of a suitable thumbscrew, whereby the point can be securely held in position interiorly of said body, which latter can then be carried in the pocket without dauger of infiicting injury, the pin being permitted to drop into operative position upon proper manipulat-ion of the tightening-screw, whereby the jaws are opened and the pin released.

It further consists of novel details of construction, all as Will be hereinafter fully set forth, and particularly pointed out in the claims.

Figure l represents a sectional view of a plumb-bob embodying my invention, the jaws and thumb-screw thereof being shown in elevation. Fig represents a sectional View similar to Fig. 1, showing all the parts in section, with the exception of the movable pin.

Similar letters of reference indicate corresponding parts in the figures.

Referringto the d rawings, A designates the body of the plumb, which can be made of bronze or other suitable material, and has the Chamber or passage B therethrough, in the upper portion of which is seated the plug or closure C, which has the opening D therethrough, in which is located the cord or other connection E.

F designates a shoulder located inthe passage B, upon which the nut G is adapted to Serial No. 709,000. (No model.)

abut, the latter being mounted on the movable pin H, which is preferably made of steel or similar material, and can be used either tight or loose, in which latter condition it prevents wearing of the point. The lower portion J of the pin is smooth or unthreaded and passes through the jaws K, it being seen that the upper and lower portions L and N of said jaws are chamfered or beveled, said upper portion L engaging the beveled shoulder M, while the lower beveled portion of said jaws engages the beveled surface of the adjustiug thuinb-screw P, which latter has a passage therethrough, in which is seated the lower portion or point S of said pin. The thumb-screw P is provided with screw-threads R and adapted to engage a suitable threaded portion of the body A.

T designates a recess in the lower portion of the body A, into which the portion U of the thumb-screw P is adapted to be screwed, the contacting portions of said thumb-screw and body thus forming a stop whereby the position of said thumb-screw relative to the body A is always assured.

The operation is as follows: The parts are seen in assembled operative position in Fig. 1, and it will be apparent that by proper manipulation of the thumb-screw I) the jaws K can be clamped, so as to lock the pin H in the position seen in Fig. 1, or, if desired, the said jaws may engage said pin loosely and permit free motion thereof under all conditions, the distance which it is desired to have the point S protrude being regulated by proper manipulation of the nut G, the contact of the latter With the shoulder F determining how much of the point S may be visible.

Then the plumb-bob is not in use, the pin H is pushed into the position seen in Fig. 2 and the thumb-screw P is tightened, whereby the pin S is securelyheld in position and can be carried in the pocket without danger of infiicting injury. When the thumb-screw P is loosened, the jaws are opened, and the pin being released can then be securely fastened in the desired position by said thumb-screw.

It will be apparent that various changes may be made by those skilled in the art which will come Within the scope of my invention, and I do not therefore desire to be limited in IOO every instance to the exact construction I have herein shown and described.

Having thusl described my invention, What I claim as new,'and desire to secure by Letters Patent, is-

1. In a plumb-bob, a body having a passage extending therethrough, a movable pin contained in said passage, a shoulder in thelatter, and an adjustabie nut or similar device carried by said pin and adapted to rest upon said shoulder, said nut being disengaged from the walls of said passage.

2. In a piumb-bob, a body portion, an axially-extending passage therethrough, a ciosure for the upper portion of said passag'e, a shoulder in the latter, a threaded pin located in said passage and carrying a nut orV other adj usting device adapted to contact with said shoulder, int'eriorly -located jaws engaging said pin and a thu mb-screw for actuatingsaid Jaws.

3. In a plumb-bob, a body portion having a passage extending therethrough, a closure for the upper portion of said passage, a threaded pin provided with a nut for en gagernent therewith, a shoulder in said passage upon which said nut is adapted to abut, the lower portion of said pin being unthreaded, jaws having beveled upper and lowerportions located interiorly of said plunib-bob and engaging said pin, and a thuinb-screw engaging the lower portion of said plumb-bob and having its .upper portionsbeveled to contact with said jaws,

said adjusting-screw having a pas'sage therethrough.

4. In a plumb-bob, a body having a passage extending therethrough, a inovable pin 10-' cated in said passage, an adjustable nut carried by said pin, a shouider in said passage upon which said pin is adapted to abut, clamp'- ing devices for the lower portion of said pin, and means for actuating said clamping de-' vices.

5. In aplumb-bob, a body having a passage extending therethrough, a movable pin 10- cated' in said passage, an adjustable nut carried by said pin, a shoulder in said passage upon which said pin is adapted to abut, clamping devices for the lower portion of said pin and means for adjusting said clamping devices, said means having an opening thei'ein, through which said pin passes'.

6. In a plumb-bob, a body having a passage cxtending therethrough, a movable pin located in said passage, an adjustable nut engaging said pin, said nut being disengaged from the Walls of said passage, a shoulder in the latter upon which said nut is adapted to rest, clamping devices located in said passage and engaging' the lower portion of said pin and means for adjusting said clamping' devices, said pin passing through said means.

ARNOLD NACKE.

W'itnesses: w

WM. O. WIEDERSHEIM, E. HAYWARD FAIRBANKS. 

